JP2015530302A - Vehicle intrusion detection system and method - Google Patents

Abstract

The present invention relates to a vehicle intrusion detection system and method capable of minimizing false detection and reducing system manufacturing costs while effectively detecting various forms of vehicle intrusion. A vehicle intrusion detection system that is mounted on a vehicle and detects vehicle intrusion, detects light or a signal reflected from an object, generates a first detection signal, and outputs the generated first detection signal. A first sensor unit, a control unit that controls the operation of the first sensor unit and receives a first sensing signal from the first sensor, and a second sensing signal that senses rotation, tilt, or impact of the vehicle. And a second sensor unit for inputting the generated second sensing signal to the control unit, wherein the first sensor unit and the second sensor unit are mounted on a single module. Is done. [Selection] Figure 1

Description

  The present invention relates to a vehicle intrusion detection system and method, and more particularly to a vehicle intrusion detection system that can effectively detect various forms of vehicle intrusion while minimizing false detection and reducing system manufacturing costs. And a vehicle intrusion detection method used in this system.

  Today, the vehicle anti-theft system is required to have performance and specifications so as to maintain a safe state of the vehicle from the inside and outside of the parked vehicle. Therefore, recent vehicle anti-theft systems have various situations such as detection of window breakage for intrusion, detection of goods theft in vehicles, detection of tire theft of parked vehicles, detection of illegal traction and movement of vehicles, etc. In this case, there is a function of generating an audiovisual effect around the vehicle and maintaining the safety of the vehicle.

  As an example, the Automotive Engineering Laboratory (Thatcham) in the UK has been developing various activities in a continuous manner in order to improve the anti-theft performance of vehicles by forming another Vehicle Anti-Theft Department (Vehicle Security Department). Yes. In addition to Denso, Japan, a stolen vehicle position tracker, an ultrasonic sensor for detecting unauthorized intruders in the vehicle, a glass break sensor, a tilt sensor for detecting a tilted vehicle body, and an automobile. A technology to maintain vehicle security using an impact sensor for detecting the applied impact force is proposed. Such DENSO technology is disclosed in Korean Published Patent Publication No. 10-2005-0074324 (2005.07.18).

  However, the conventional ultrasonic sensor for detecting intrusion in a vehicle has a problem that the battery is excessively discharged in order to continuously generate ultrasonic waves. In addition, the ultrasonic sensor frequently misdetects a signal change detected in the vehicle due to a simple external impact to the intrusion into the vehicle interior. In order to prevent this, a signal that falls outside the fixed reception level range with conventional ultrasonic sensors can be regarded as noise and removed, but in that case, the reception sensitivity with the fixed reception level range removed exceeds the specified size. Therefore, the transmission level must be increased by a certain level or more, which limits the adjustment range of the sensor in the adjustment of the reception sensitivity of the ultrasonic sensor. Further, if the reception sensitivity is maintained above a certain size, there is a problem that the battery consumption is further increased.

  In addition, some conventional vehicle antitheft devices use a tilt sensor or impact sensor to detect the impact on the vehicle or the tilt of the vehicle, but in that case, the sensor is also sensitive to simple external impacts. There is a disadvantage that a malfunction often occurs in response.

  The present invention has been devised in order to solve the above-described problems of the prior art, and an object of the present invention is to use a second sensor that senses impact, movement, or tilt on a vehicle. An object of the present invention is to provide a vehicle intrusion detection system and method capable of improving intrusion detection performance by suppressing false detection of one sensor.

  In addition, an object of the present invention is to manufacture the first sensor and the second sensor in a single module and provide them on the ceiling of the vehicle, so that the manufacturing cost of the system can be reduced. It is an object of the present invention to provide a vehicle intrusion detection system and method capable of detecting an intrusion.

  In order to solve the above technical problem, a vehicle intrusion detection system according to one aspect of the present invention is a vehicle intrusion detection system that is mounted on a vehicle and detects vehicle intrusion, and is configured to detect light and signals reflected from an object. A first sensor unit that senses and generates a first sensing signal, outputs the generated first sensing signal, and controls the operation of the first sensor unit; A control unit that receives the signal; and a second sensor unit that detects rotation, tilt, or impact of the vehicle to generate a second detection signal, and inputs the generated second detection signal to the control unit. . Here, the first sensor unit and the second sensor unit are mounted on a single module.

  In one embodiment, the single module comprises a vehicle overhead console configuration.

  In one embodiment, the first sensor unit includes a transmitter that outputs light and signals having a fixed period, a receiver that receives light and signals reflected from an object, and a signal processing control signal of the control unit. A signal processing unit that applies a transmission signal to the transmitter and a signal analysis unit that analyzes a signal input via the receiver.

  In one embodiment, the first sensor unit includes an ultrasonic sensor including a transmitter and a receiver, and the second sensor unit includes a gyro sensor or an impact sensor.

  In one embodiment, when the vehicle intrusion is detected by the first sensing signal, the control unit further investigates vehicle intrusion by increasing the transmission level of the transmitter from the transmission level of the transmitter before the intrusion detection investigation. .

  In one embodiment, the control unit compares the current pattern data of the first sensor unit with the pattern data of the second sensor unit stored in advance, and determines the presence or absence of an impact based on the comparison result. Senses intrusion or impact on the vehicle.

  A vehicle intrusion detection method according to an aspect of the present invention includes a first sensor unit that detects light or a signal reflected from an object, generates a first detection signal, and outputs the generated first detection signal; A controller for controlling the operation of the first sensor unit and receiving a first sensing signal from the first sensor unit; and generating a second sensing signal by sensing rotation, tilt or impact of the vehicle; A vehicle intrusion detection method for detecting vehicle intrusion by a vehicle intrusion detection system including a second sensor unit for inputting the generated second detection signal to the control unit, the vehicle intrusion detection method being received via the first sensor unit. A first step of investigating vehicle intrusion based on the first sensing signal, and at the time of vehicle intrusion sensing by the first sensing signal, the transmission level of the transmitter of the first sensor unit is Increasing the transmission level of the transmitter If the vehicle intrusion is detected for a predetermined time or more in the second step and the second step of further investigating the current pattern data of the first sensor unit and the previously stored second sensor unit A third step of detecting an intrusion or impact on the vehicle by comparing the second pattern data with each other to determine the presence or absence of the impact.

  In one embodiment, the first pattern data is a voltage that is numerically displayed in which voltage section the received data sampled at preset sampling time intervals is input from the first sensor unit to the control unit. A time table is provided, and the second pattern data includes a corresponding integer value obtained by averaging the sampling data of the angle change sampled a plurality of times at a predetermined interval for a predetermined time, and dividing the averaged value into a predetermined step. In this case, the third step compares the number of the first pattern data with a preset first reference value, and compares the integer value of the second pattern data with a preset second reference value. Thus, a step of detecting whether or not the vehicle has entered the vehicle is included.

  According to the present invention, by using the second sensor unit, various kinds of detection such as window breakage detection, intrusion detection in the vehicle, goods theft act in the vehicle, parking, vehicle tire theft detection, illegal traction and movement detection, etc. Accordingly, it is possible to provide a highly efficient and high performance vehicle intrusion detection system and method capable of suppressing erroneous detection of vehicle intrusion detection while detecting various forms of vehicle intrusion and reducing the manufacturing cost of the system.

  That is, external impact and vehicle intrusion are discriminated and discriminated based on the detection signal of the second sensor unit (gyro sensor, etc.) and the detection signal of the first sensor (ultrasonic sensor, etc.), so that the external simple impact It is possible to minimize misdetection of vehicle movement and tilt caused by movement and movement, thereby effectively detecting various forms of vehicle intrusion while improving system performance. For example, by using the second sensor unit to improve the performance of the basic vehicle intrusion detection function and minimize false detection, monitoring of vehicle tire ground separation, detection of illegal traction or movement, etc. An extended vehicle intrusion detection function can be performed.

  Furthermore, according to the vehicle intrusion detection system of the present invention, the module is provided by providing a single module on which the first sensor unit and the second sensor unit are mounted on the overhead console (OHC) of the vehicle. Not only can the manufacturing cost be reduced, the single module provided in the overhead console can effectively monitor the intrusion into one to three rows in the vehicle.

  FIG. 1 is a schematic block diagram of a vehicle intrusion detection system according to an embodiment of the present invention.

  FIG. 2 is a schematic block diagram of a signal analysis unit that can be employed in the vehicle intrusion detection system of FIG.

  FIG. 3 is a view showing an embodiment in which the sensor module of the vehicle intrusion detection system of FIG. 1 is mounted on a vehicle.

  FIG. 4 is a schematic flowchart of a vehicle intrusion detection method according to an embodiment of the present invention.

  5 and 6 are flowcharts showing a pattern processing process that can be employed in the vehicle intrusion detection method of FIG.

  7 and 8 are graphs for explaining the boosting operation principle of the first sensor unit that can be employed in the vehicle intrusion detection method of FIG.

  FIG. 9 is a graph showing an example of signals detected from the receiver of the vehicle intrusion detection system of FIG.

  FIG. 10 is a flowchart for explaining the operating principle of the second sensor unit of the vehicle intrusion detection system of FIG.

  FIG. 11 is a diagram for explaining a mapping table storing signals received from the second sensor unit of FIG.

  FIG. 12 is a graph schematically showing an intrusion detection range by the second sensor unit of FIG.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The term “vehicle intrusion detection” in the following description basically means intrusion detection in the vehicle interior, but detection of window breakage for intrusion, detection of goods theft in the vehicle, parking, tire stealing of the vehicle. It may include sensing various forms of vehicle-related theft such as sensing, illegal traction and movement sensing.

  FIG. 1 is a schematic block diagram of a vehicle intrusion detection system according to an embodiment of the present invention.

  As shown in FIG. 1, the vehicle intrusion detection system 100 according to the present embodiment includes a first sensor unit 110, a control unit 120, and a second sensor unit 130. The vehicle intrusion detection system 100 is preferably provided in the vehicle 10, particularly on the upper side (such as the ceiling of the vehicle) inside the vehicle 10 for effective intrusion detection of the first sensor unit 110.

  The first sensor unit 110 transmits light or a signal (such as a sound wave) having a constant period and amplitude, detects light or a signal reflected from an object, generates a first detection signal, and generates the generated first A sensing signal is output. An ultrasonic sensor or the like can be used as the first sensor unit 110.

  The controller 120 is connected to the first sensor unit 110, controls the operation of the first sensor unit 110, and receives a first sensing signal from the first sensor unit 110. The controller 120 may be manufactured as a single module together with the first sensor unit 110. Further, the control unit 120 can be mounted on a predetermined electronic control unit (ECU: Electronic Control Unit) in the vehicle.

  The second sensor unit 130 detects the movement of the vehicle including rotation and inclination, vehicle vibration, or shock, generates a second detection signal, and inputs the generated second detection signal to the control unit 120. As the second sensor unit 130, a gyro sensor or the like can be used.

  When the first sensor unit 110 described above includes an ultrasonic sensor, the first sensor unit 110 may include a signal processing unit 111, a transmitter 112, a receiver 113, and a signal analysis unit 114. it can.

  Here, the signal processing unit 111 corresponds to a unit that applies a transmission signal to the transmitter 112 according to a signal processing control signal of the control unit 120, or a configuration unit that performs a function corresponding to such a unit. The signal processing unit 110 receives a pulse signal that has been subjected to pulse width modulation (PWM) from the control unit 120, and the first signal obtained by inverting this pulse signal, or the first signal that has not been inverted. It can be realized as an inverter that generates a combination of the two signals and the first signal and transmits them to the transmitter 112. The transmitter 112 transmits an ultrasonic signal having a constant period in response to the transmission signal of the signal processing unit 111.

  The receiver 113 receives a reflected wave in which an ultrasonic signal transmitted from the transmitter 112 is reflected by a vehicle inner wall or an object. The signal analysis unit 114 amplifies the reflected wave received by the receiver 113, senses the envelope with the amplified reflected wave, and supplies the detected envelope to the control unit 120. A configuration that can be employed in such a signal analysis unit 114 will be described later.

  In the vehicle sensing system 100 according to the present embodiment, the control unit 120 can be connected to a power supply unit 11, an off switch 12, and a body control module (BCM: Body Control Module) 13. And the control part 120 can be connected to the LED display (not shown) which displays the state of the off switch 12 according to the signal from a control part.

  Here, the off switch 12 is a user interface for inactivating or turning off the warning mode of the vehicle intrusion detection system. When the user presses the off switch 12, the control unit 120 of the vehicle intrusion detection system 100 is deactivated and does not enter the alert mode for vehicle intrusion detection.

  The vehicle body control module 13 corresponds to a unit in which a plurality of electronic control units (ECUs) applied to various devices of the vehicle are integrated into one central control unit. The vehicle body control module 13 can actuate the alarm device 14 based on a signal from the control unit 120 to send a visual and / or audible alarm around the vehicle.

  The power supply unit 12 is for supplying different voltages to the components of the vehicle intrusion detection system, and includes a battery, a battery protection device, a voltage regulator, a voltage distributor, or a combination thereof. Can do. The battery protection device may include a surge protector for protecting each component of the battery or vehicle intrusion detection system from a momentary sudden current (Surge).

  FIG. 2 is a schematic block diagram of a signal analysis unit that can be employed in the vehicle intrusion detection system of FIG.

  As shown in FIG. 2, the signal analysis unit 114 according to this embodiment includes a voltage follower 1141, a first amplifier 1142, a second amplifier 1143, a detector 1144, and an integration-amplifier 1145.

  The voltage follower 1141 and the first amplifier 1142 amplify the input signal from the receiver 113 based on the reference voltage from the power supply unit 11. In the present embodiment, the voltage follower 1141 and the first amplifier 1142 are preferably operational amplifiers (OPAMP) 114a having linearity that generate the output signal “1” with respect to the input signal “1”.

  The second amplifier 1143, the detector 1144, and the integration-amplifier 1145 amplify the input signal from the first amplifier 1142. In the present embodiment, the second amplifier 1143, the detector 1144, and the integration-amplifier 1145 preferably have the characteristics of a rail-to-rail operational amplifier (OPAMP) 114b.

  The operation process of the signal analysis unit 114 will be briefly described as follows.

  When the predetermined voltage V1 of the power supply unit 11 is input to the voltage follower 1141 and the reference voltage V2 of the voltage follower 1141 is input to the first amplifier 1142, the reflected wave input from the receiver 113 is the first amplifier 1142. It is amplified by. The signal amplified by the first amplifier 1142 is amplified again via the second amplifier 1143 and passes through the detector 1144. At this time, the detector 1144 demodulates only the outline of the signal to be talked. The demodulated signal is amplified via the integration-amplifier 1145 and input to the control unit 120. The control unit 120 includes an analog-digital converter port that converts an analog signal input from the integration-amplifier 1145 into a digital signal.

  When there is no vehicle intrusion, the reflected wave includes only the coupling wave that is reflected and fed back regardless of the movement of the object in the vehicle, and when compared to the previously analyzed reflected wave, It corresponds to a signal that does not change at all, and corresponds to a combined wave of a reflected signal (Reflected Wave) reflected by an object and fed back when a vehicle enters and a coupling signal. If the reflected wave is detected by envelope detection, an analog signal that can be discriminated by the control unit 120 can be generated.

  If there is no change in the reflected wave received by the receiver 113 in the operation process of the signal analysis unit 114 described above, the envelope form is not demodulated by the detector 1144, and the reflected wave is output at a constant level. If the reflected wave received at 113 has a change of a predetermined size or more, the reflected wave is demodulated by the detector 1144 and output as a signal having a large amplitude change or frequency change.

  FIG. 3 is a view showing an embodiment in which the sensor module of the vehicle intrusion detection system of FIG. 1 is mounted on a vehicle.

  In the vehicle intrusion detection system 110 described above with reference to FIG. 1, the first sensor unit 110 and the second sensor unit 130 may be made of a single sensor module. Of course, it is also possible to mount the control unit 120 together in a single sensor module.

  For example, as shown in FIG. 3, the single sensor module 102 of the present embodiment is provided in the overhead console 20 of the vehicle. The single sensor module 102 includes a 1A sensor unit that monitors a region located on the left side from the central portion and a 1B sensor unit that monitors a region located on the right side from the central portion in one to three rows of the vehicle. A sensor unit.

  Here, the 1A sensor unit includes the first ultrasonic transmitter 112a and the first ultrasonic receiver 113a, and the 1B sensor unit includes the second ultrasonic transmitter 112b and the second ultrasonic transmitter. A sound wave receiver 113b is provided. In FIG. 3, the second sensor unit 130 is indicated by a dotted line together with the single sensor module 102 built in the overhead console 20.

  The above-described overhead console 20 is usually provided in front of the ceiling surface between the driver's seat and the passenger seat of the vehicle, a lamp that illuminates the driver's seat and the passenger seat, a storage box 22 that can store sunglasses, and a dialog box. In this embodiment, by mounting the single module 102 on which the first sensor unit and the second sensor unit of the vehicle intrusion detection system are mounted on the overhead console 20, in this embodiment, Easy standardization of a single module enables efficient manufacturing, installation and operation of the entire system.

  Further, in the vehicle intrusion detection system according to the present embodiment, the sensor module including the first sensor unit and the second sensor unit is provided in the overhead console, so that the vehicle intrusion detection system for the vehicle intrusion detection system is separately provided. Since there is no need to use the unit, there is an advantage of cost reduction.

  FIG. 4 is a schematic flowchart of a vehicle intrusion detection method according to an embodiment of the present invention.

  As shown in FIG. 4, the vehicle intrusion detection system according to the present embodiment checks the operation state of the off switch and the initial states of the first sensor unit and the second sensor unit. The confirmation of the operation state of the off switch is for entering the alert mode when the basic system information with the vehicle body control module (BCM, Body Control Module) is satisfied. The interface or communication between the vehicle intrusion detection system and the external BCM can be performed by LIN (Local Interconnect Network) communication.

  As a result of the above confirmation, if the operation state of the off switch is activated or turned off (OFF), the intrusion detection system is deactivated or turned off and deactivated, and the operation state of the off switch is not activated or turned off. In this case, the intrusion detection operation is started by entering the alert mode according to a predetermined process (S401).

  If the control unit outputs a pulse width modulation signal after entering the warning mode of the vehicle, the pulse width modulation signal is input to the transmitter via the transmission side inverter. The transmitter outputs a signal having a constant period and a constant width in the normal alert mode.

  If there is no intrusion in the vehicle, the signal received via the receiver has a certain form of level waveform with little variation. In this case, the control unit determines that there is no input for intrusion detection, and does not report another alarm signal to the BCM.

  On the other hand, when an intrusion into the vehicle is detected during a preset first time, a signal received via the receiver has a level waveform whose amplitude and frequency vary. Further, the received signal is filtered and amplified through an amplifier, and converted to an analog level through envelope detection so as to be readable by the control unit (corresponding to one-step intrusion investigation) (S402, S403). .

  The input to the control unit for intrusion detection is determined by whether the signal level converted by the analog-digital converter provided at the input end of the control unit is greater than or less than a preset reference level. Can do.

  Next, in order to switch to the warning mode for the two-step intrusion detection after the above-described one-step intrusion detection, the control unit determines whether there is a movement detected above a certain level during the second time. (Corresponding to a two-step intrusion investigation) (S404, S405).

  If there is a movement detected above a certain level during the second time, the control unit functions to send a second transmission signal boosted from the first transmission signal after two steps of intrusion detection. (S406). The second time interval for a two-step intrusion survey is preferably longer than the first time interval for a one-step intrusion survey.

  If the boost function of the transmitter is used, vehicle intrusion is sensed in response to signals sent intermittently during normal times, and in three steps in response to signals sent continuously after two steps of intrusion detection. By sensing the intrusion of the vehicle, the dark current consumed by the first sensor unit can be reduced as compared with the case where a signal is continuously transmitted even during normal times. Dark current reduction is extremely useful as a function of a vehicle intrusion detection system that operates with a limited capacity, such as a vehicle battery, connected to a power source.

  The control unit compares the signal input from the first sensor unit with a preset value, and can transmit an alarm request signal to the BCM via the LIN communication based on the comparison result.

  Next, after boosting the transmission level of the first sensor unit, the control unit is sensed above a certain level during a third time to switch to a warning mode for intrusion detection in three steps. It is confirmed whether there is a continuous movement (corresponding to a three-step intrusion investigation) (S407). The third time interval for three-step intrusion detection is preferably longer than the second time interval for two-step intrusion detection.

  If there is no continuous movement sensed above a certain level during the third time, the controller can end the current alert mode and initialize the alert mode. On the other hand, if there is a continuous movement detected above a certain level during the third time, the control unit proceeds to the next pattern processor (S408).

  Next, the control unit compares the current pattern data of the first sensor unit with the previously stored pattern data of the second sensor unit (S410), and the first sensor unit enters based on the comparison result. It is determined whether the sensing is due to an impact (S411). This step or the like (S410, S411) corresponds to the pattern processing process. And a control part discriminate | determines impact detection and intrusion detection according to the determination result of the presence or absence of an impact (S412, S413).

  The pattern processing process indicates filtering an intrusion detection determination based on a signal input from the first sensor unit based on an input signal from the second sensor unit. If the pattern processing process is used, it is possible to prevent the first sensor unit from reacting sensitively due to a simple external vehicle impact or the like. Furthermore, the use of the second sensor unit used in the pattern processing process can be increased to apply a warning function for the inclination of the vehicle body, and the movement and inclination of the vehicle body can be monitored or the tire ground can be detected. . Such a pattern processor will be described in further detail below.

  5 and 6 are flowcharts showing a pattern processing process that can be employed in the vehicle intrusion detection method of FIG.

  As shown in FIG. 5, the vehicle intrusion detection system analyzes the first pattern data and the second pattern data (S4101). Here, the first pattern data is a set of signals input to the control unit a plurality of times within a preset time range, and as shown in FIG. 7 or FIG. It can be expressed in the form of a table or mapping table. This step (S4101) corresponds to the first pattern data corresponding to the first pattern data which is the current pattern data of the first sensor unit among the pattern data of the second sensor unit stored in advance in the predetermined storage unit in the system. 2 pattern data is extracted, and the following steps (S4102 to S4108) are performed.

  First, the control unit determines whether the size of the ultrasonic signal input to the control unit is a preset size (for example, 2) or less and the frequency is 80 Hz or more (S4102). If the size of the ultrasonic signal is greater than 2 or the frequency is less than 80 Hz, the control unit sets the frequency to 0 and proceeds to the next step (S4103).

  Next, the control unit determines whether the product of three consecutive cells of the first pattern data is 4 or more (S4104). If the product of three consecutive cells of the first pattern data is smaller than 4, the control unit determines that it is not an intrusion (S412a). That is, the control unit determines that the impact here is a simple external impact.

  Next, if the product of three consecutive cells of the first pattern data is 4 or more, the control unit has an accumulated impact amount of 5 or more for the corresponding three consecutive cells of the second pattern data. Is determined (S4105). If the cumulative impact amount of the second pattern data is smaller than 5, the control unit determines that a simple external impact is detected that is not intrusion (S412b).

  Next, if the cumulative impact amount of the second pattern data is 5 or more, the control unit calculates the sum of the frequencies of the six adjacent cells of the first pattern data (S4106). Further, the control unit determines whether the total of the calculated frequencies is 180 Hz or higher or the average frequency is 30 Hz or higher (S4107). If the total frequency is 180 Hz or more, the control unit determines whether the frequency of each cell is 35 Hz or more (S4108). As a result of the above determination, if the frequency of each cell of the first pattern data is 35 Hz or more, the control unit determines that the intrusion detection by the first pattern data is not due to actual intrusion but due to external impact ( S412b).

  Next, as shown in FIG. 6, as a result of the determination in the above-mentioned steps (S4107, S4108), the frequency of each cell of the first pattern data is less than 35 Hz, or six adjacent first pattern data If the total number of cells is less than 180, the cell in which the size of the ultrasonic signal of the first pattern data is 3 or more and the cell in which the size of the impact signal of the second pattern data is 0 or more are investigated. (S4110). Then, in the first pattern data and the second pattern data, the control unit is 3 or more for four cells in which the size of the ultrasonic signal is continuous, and the sum of the frequencies of the four cells is 120 Hz or more. Yes, it is determined whether or not the condition that the size of the impact signal is 0 in four consecutive cells is met (S4111). If the condition of step (S4111) is met, the control unit determines that the vehicle has been detected (S413).

  Subsequently, if the condition of the step (S4111) is not met, the control unit investigates the impact cell of the second pattern data whose size is 3 or more (S4112). Then, the control unit determines whether there are 8 or more cells having an impact size of 3 or more (S4113). If there are eight cells having an impact size of 3 or more in the second pattern data, the control unit determines that the current first pattern data is not entering the vehicle interior and is due to an external impact (S412C).

  Next, if there are not eight or more cells having an impact size of 3 or more in the second pattern data, the control unit investigates the sum of the frequencies of all the cells using the first pattern data (S4114). And a control part judges whether the sum total of the frequency of a whole cell is 350 Hz or more, or an average frequency is 25 Hz or more (S4115). If the sum of the frequencies of all the cells of the first pattern data is less than 350 Hz, the control unit determines that the vehicle has not entered the vehicle interior and is an external impact (S412C). If the sum of the frequencies of all the cells of the first pattern data is 350 Hz or more as a result of the above determination, the control unit determines that a vehicle room intrusion has been detected by this pattern processing process (S413).

  7 and 8 are graphs for explaining the boosting operation principle of the first sensor unit that can be employed in the vehicle intrusion detection method of FIG. FIG. 9 is a graph showing an example of signals detected from the receiver of the vehicle intrusion detection system of FIG.

  As shown in FIG. 7, the signal input from the first sensor unit to the control unit is a voltage − which indicates in which voltage section the received data sampled at preset sampling time intervals is located. Simplified display on the time table.

  If the signal level input from the first sensor unit to the control unit is greater than the reference level during the period from t0 to t2, the control unit determines the transmission level of the transmitter of the first sensor unit at the time t2. Can be boosted for a period of time. Here, the reference level can be set so as to correspond to the level range of one step among the levels A1 to A6.

  In the case described above, the control unit can be regarded as an intrusion if a signal exceeding the reference level is input from the first sensor unit during the time from t0 to t2. Such intrusion detection corresponds to detecting an intrusion before boosting the transmission level of the first sensor unit during a two-step intrusion investigation. Such intrusion detection can also be applied to a one-step intrusion investigation.

  As another embodiment, as shown in FIG. 8, when the specific level (A3) is set as the reference level, the first level is set at every predetermined time interval (t0 to t1, t1 to t2, t2 to t3). If the sampling data of the signal input from the sensor unit to the control unit moves above and below the reference level, the control unit can detect the frequency from the input signal.

  For example, in FIG. 8, since one frequency data is formed in the range from t0 to t3, this can be executed four times to select the largest frequency component as a representative value. Such frequency data can be applied to determine whether there is an intrusion detection above a certain level during the two-step intrusion investigation of FIG.

  The determination of intrusion detection using the frequency data described above is useful when detecting cracks in the vehicle window. As shown in FIG. 9, when the vehicle window breaks, more frequency components 901 are detected by the first sensor unit due to debris scattered inside and outside the vehicle, and from the first sensor unit to the control unit. This is because the input signal includes specific frequency data.

  FIG. 10 is a flowchart for explaining the operating principle of the second sensor unit of the vehicle intrusion detection system of FIG. FIG. 11 is a diagram for explaining a mapping table storing signals received from the second sensor unit of FIG. FIG. 12 is a graph schematically showing an intrusion detection range by the second sensor unit of FIG.

  As shown in FIG. 10, the control unit sets the initial value of the second sensor unit after entering the alert mode (S1001).

  Next, the control unit determines the angle change in the alert mode (S1002, S1003). If there is no angle change, the control unit maintains the alert mode.

  Next, the control unit collects data a plurality of times for a predetermined time (S1004). The fixed time is a time suitable for determining a simple external impact, and may be about 1 to 5 seconds. In this step (S1004), sampling data is collected at a predetermined sampling period during a preset time interval.

  Subsequently, the control unit can remove the impact noise with a predetermined data collection standard (S1005). For example, as shown in FIG. 11, when an angle change of a predetermined angle with respect to the reference angle is sensed, the control unit starts data collection via the second sensor unit or is constant with respect to the reference angle. Data can be collected only within the angular range (the hatched portion in FIG. 11). In that case, an angular change outside a certain range is removed from the collected data as impact noise. In addition, the control unit of the vehicle intrusion detection system can remove the impact noise by comparing the current sampling data with the sampling data sampled immediately before and discarding more than a preset angle.

  Next, the control unit converts the average value of the collected data (S1006). If the average value difference is 4 or more, the control unit may output an alarm via the vehicle BCM, or if the average value difference is less than 4, the control unit may operate so as not to output the alarm. Yes (S1007, S1008, S1009).

  For example, as illustrated in FIG. 12, the control unit can represent an angle change at the time of sampling as an integer value expressed in a predetermined step or level. That is, in the table in which the sampling period for 1 to 5 times is a horizontal item and the positive and negative are vertical items with respect to the reference angle with respect to the X axis and the Y axis of the second sensor unit, The angle change between is substantially only on the + X axis, and the average (X1) of the angles corresponds to the integer value 9 expressed in a predetermined step, and the angle change during the second sampling period is substantially Only on the + X axis, the average of the angles (X2) corresponds to the integer value 14 expressed in a given step, and there is virtually no change in angle during the third sampling period, so that of that angle The average (X3) corresponds to the integer value 0 expressed in a predetermined step, and the angular change during the fourth sampling period is substantially only on the + X axis, and the average (X4) of the angles is the predetermined step. table Corresponding to the integer value 19, and the angle change between the fifth sampling period, there only substantially + X-axis, the average of the angle (X5) corresponding to the integer value 18 expressed in a given step. Here, the integer value 14 is a value set in advance corresponding to a predetermined reference inclination angle, and each sampling period corresponds to a time obtained by dividing a reference time range to be determined as a simple external impact by 5. be able to.

  In FIG. 12, it can be determined that the sampling data for the −X axis, the + Y axis, and the −Y axis has been invalidated due to unsatisfactory conditions in the direction determination step. Then, if it is assumed that the reference value is less than 14 and the reference for the number of inclination determinations is 3 or more, the control unit performs the first to fifth sampling periods based on the sampling data of X2, X4, and X5. It can be determined that the vehicle has tilted during this period.

  On the other hand, in the vehicle intrusion detection system of the above-described embodiment, after entering the alert mode, the transmitter transmission level is boosted after the one-step intrusion investigation and the two-step intrusion investigation, and the three-step intrusion investigation is performed. However, the present invention is not limited to such a configuration, and can be realized to selectively perform only one of the above-described one-step intrusion investigation and two-step intrusion investigation.

  The above-described embodiments are not intended to limit the scope of the present invention, but are merely exemplary items of the components presented in the claims of the present invention, and are described throughout the specification of the present invention. Embodiments that include components that are included in the technical idea and can be replaced by equivalent components in the claims can be included in the scope of the right of the present invention.

Claims (8)

A vehicle intrusion detection system that is mounted on a vehicle and detects vehicle intrusion,
A first sensor unit that senses light or a signal reflected from an object, generates a first sensing signal, and outputs the generated first sensing signal;
A control unit for controlling the operation of the first sensor unit and receiving a first sensing signal from the first sensor unit;
A second sensor unit that senses rotation, tilt, or impact of the vehicle to generate a second sensing signal, and inputs the generated second sensing signal to the control unit;
With
The control unit detects an intrusion in a vehicle compartment or determines whether there is an external simple impact based on the first sensing signal filtered based on the second sensing signal. Sensing system. The first sensor unit includes:
A transmitter that outputs light and signals with a fixed period;
A receiver that receives light and signals reflected from an object;
A signal processing unit that applies a transmission signal to the transmitter according to a signal processing control signal of the control unit;
A signal analyzer for analyzing a signal input via the receiver;
The vehicle intrusion detection system according to claim 1, comprising:   The vehicle according to claim 2, wherein the first sensor unit includes an ultrasonic sensor including the transmitter and a receiver, and the second sensor unit includes a gyro sensor or an impact sensor. Intrusion detection system. The control unit determines whether the vehicle has entered based on the first sensing signal received through the first sensor unit, and then the second sensing signal from the second sensor unit is for a certain period of time. By determining whether the vehicle is above a certain level, vehicle intrusion is detected based on the first detection signal,
The vehicle intrusion is further investigated by increasing a transmission level of the transmitter from a transmission level of the transmitter before the intrusion detection when the vehicle intrusion is detected by the first detection signal. The vehicle intrusion detection system according to 2.   The control unit averages sampling data of angle changes sampled a plurality of times at a predetermined interval from the second sensor unit for a predetermined time, and second pattern data in a table in which the average value is divided into predetermined steps. When the integer value above a certain level is within a preset reference value range, the voltage range of the first sensing signal sampled from the first sensor unit at a preset sampling time interval An intrusion in the vehicle compartment or an external simple impact is detected based on at least one of a signal strength and a waveform change in a voltage-time table indicating whether the vehicle is located in the vehicle. 5. The vehicle intrusion detection system according to 4. The first sensor unit and the second sensor unit are mounted on a single module;
The vehicle intrusion detection system according to claim 1, wherein the single module is mounted on an overhead console of the vehicle. A first sensor unit that senses light or a signal reflected from an object to generate a first sensing signal, and outputs the generated first sensing signal; and controls operations of the first sensor unit; A control unit that receives a first sensing signal from the first sensor unit, and generates a second sensing signal by sensing rotation, tilt, or impact of the vehicle, and sends the generated second sensing signal to the control unit. A vehicle intrusion detection method for detecting vehicle intrusion with a vehicle intrusion detection system including a second sensor unit for input,
After detecting the vehicle intrusion based on the first sensing signal received through the first sensor unit, the second sensing signal from the second sensor unit is at a certain level or more for a certain time. Determining whether there is a vehicle intrusion by the first sensing signal by determining whether there is,
When the vehicle intrusion is detected by the first sensing signal, the vehicle intrusion is further investigated by increasing the transmission level of the transmitter of the first sensor unit from the transmission level at the time of vehicle intrusion detection in the first step. Two steps,
If a vehicle intrusion is detected for a predetermined time or more in the second step, the vehicle interior is detected based on the first sensing signal filtered based on the second sensing signal or an external simple impact is detected. A third step of determining presence or absence;
A vehicle intrusion detection method including: The first pattern data includes a voltage-time table that displays in which voltage section the first sensing signal sampled at predetermined sampling time intervals from the first sensor unit is located,
The second pattern data includes a table that averages sampling data of angular changes sampled a plurality of times at a predetermined interval from the second sensor unit for a predetermined time, and divides the averaged value into predetermined steps,
In the third step, the signal strength and waveform in the voltage-time table when an integer value equal to or higher than a certain level in the second pattern data in the table is within a preset reference value range. 8. The vehicle intrusion detection method according to claim 7, wherein an intrusion or an external simple impact in the vehicle compartment is detected based on at least one of the changes.

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